Die controlling mechanism for open die metal heading machines



J. E. PRACNY May 5, 1931.

DIE GONTROL'LING MECHANISM FOR OPEN DIE METAL HEADING MACHINES Filed July le, 19:50

3 Sheets-Sheet l e ,"AAAAAAAAHAAM May 5, 1931. .J E. PRACNY 1,804,029

DIE CONTROLLING MEGHANISM FOR OPEN DIE METAL HEADING MACHINES Filed July 16, 1930 5 Sheets-Sheet 2 H 7' TORNEX May 5, 1931. J. E. PRACNY l 1,804,029

DIE CONTROLLING MECHANISM FOR OPEN DIE. METAL HEADING MACHINES Filed July' lesi 1930 s sheets-sheer s HV1/[NMR A TMR/vf y,

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Patented May 5, 1931 UNITED STATES PATENT OFFICE JOHN E.'PRACNY, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE E. J. MANVILLE MACHINE COMPANY, OF. VATERBRY,

NECTICUT CONNECTICUT, A CORPORATION OF CON- DIE CONTROLLING MECHANISIYI FOR OPEN DIE METAL HEADING MACHINES `.llppliciition filed July 16,

This invention relates to mechanism for controlling the dies of a two-blow open die header of the type illustrated and described in patent to Campbell No. 996,170, June 99, 1909, and more particularly to such headers' as are provided with dies for extruding the bodies of the blanks at the same time that they are headed, as set forth in patent to Pracny No. 1,738,312, December 3, 1929.

In this type of machines thcre'are two heading dies that are separated when in line with the stock feed and are closed and moved transversely to clamp and out oil' a length of stock fed between them and carry it into line with heading punches, and after the heading punches have operated and are receding these dies are returned Vand opened to allow a subsequent feed of stock. The heading dies aieclosed and moved over from feeding line to heading line by plungers actuated by powerful toggles, and they are returned by a heavy spring. In the machine of the Pracny patent there is a lined die back of the movable heading dies for extruding, that is, reducing and lengthening, sections of the stock coincidently with the upsetting of the ends for forming the heads. Y

VThe object of the present invention is to eliminate the possibility of bending or damaging the reduced sections of the headed blanks by the return movements of the heading dies under the pressure of the powerful return spring. This object is accomplished by positively returning the heading die which is on the plunger side of the blanks, from heading to feeding line immediately after the punches have functioned, and obstructing or retarding the action of the return springagainst the heading die on the spring side of the blanks, until after the reduced sections of the blanks have been completely' ejected from the extruding die, thus Afacilitating` the ejection of the blanks and preventing them from being bent by the force of the return spring. n Y

In the accompanying drawings Fig. 1 shows a plan view of the front end of a heading machine arranged according to this invention, with portions cut away to expose theV dies and the mechanism for moving the head- 1930. serial No. 468,293.

punches and extruding die. Fig shows a vside elevation of so much of the machine as isV necessary to illustrate the invention. Fig. 3 isa vertical section on approximately the plane indicated by the dotted line 3 on Fig.V 2, showmg the bolt for temporarily restrain-` ing the spring and retaining the heading die on the spring side. Fig. l isa transverse section of the frame looking toward the movable dies which are shown as Vclamped together and in heading and extruding position. Fig. 5 is a horizontal section taken through the dies with the movable dies in heading position. Fig. 6 is a similar view with the die on the plunger side withdrawn and the die on the springside restrained so as vto allow the blank to be ejected from 'the extruding die without being subjected to the pressure of the die returning spring.

In a die pocket 1 in the front end of the frame 2 are transversely movable dies 3, 4,.

a fixed cutting die 5 in line with the feed pening 6, and a fixed extruding di-e 7 in line with the punches 8 and-the knock-out pin 9. The movable dies are separated to permit the feed of'stock between them and to allow the discharge of the completed blank from them, and are brought together to hold the stock tightly clamp-ed while moved trans.-V versely to cut of a length of stock and while the punches are operating. vrIhe movable dies are forced transversely together from feed line to punch line by toggles 10 and link 11 (Fig.Y 1),"actuated froma cam or crank inthe well known manner.- .ening movements of the toggles are transferredato thedies through toggle block 12, plungers 13, plunger head 14 and filling block 15, and the bending movements of theV toggles.

are affected by a spring 16. A yoke. 17 has one end mortised into the plunger head 14 and the other end mortised into the die 3 (Fig 1) so that the return movements of the toggles will draw back the die 3.

l.lVhen the toggles are returned a spring 18, which thrusts against a plunger 19 that has a head 20 abutting a filling block 21, tends to push over the die 4.

The straight- The effective action of the spring 18, however, is obstructed for an interval so as to retard the return movement of the die 4 by mechanism, and for the purpose hereinafter explained.

Any common type of stock eed may be employed, that illustrated having rolls 22 which are intermittently rotated by mechanism 23 to feed the required length of stock 24 through the feed opening 6 into the machine, the stock being' in the form of a continuous rod or wire. lVith the movable dies in feed position and slightly separated the feed rolls push a length of stock through them until the stock is stopped by a gauge arm 25, which is oscillated by the usual mechanism into and out of the path of the stock. The movable dies are then forced transversely by the toggles, first closing and tightly clamping the stock, and then moving over so that a length of the stock is cut off between the back face of the movable dies 3, 4, and the front face of the cutting die 5, and the severed piece carried into line with the extruding die 7 and the punches 8. lVith the dies in this relation a punch 8 carried by a vertically movable punch holder 26 mounted in a horizontally movable gate 27, as is well understood, comes forward and strikes the stock driving it through the movable diesand forcing the inner end `into the extruding die.

The opening in the extruding die being somewhat smaller than the opening between the movable dies reduces the diameter of and extends the length of asection of the inner end of the stock, and at the same time the outer end of the stock is upset and a head partially formed. The punch holder is then vertically shifted by the usual mechanism so that on the next forward movement of the gate the second punch will complete the formation of the head, as is fully set forth in the Campbell patent before referred to.

The knock-out pin 9 is designed to limit the c: length ofthe stock that is extruded, and to subsequently drive the extruded section from the extruding die 7. Back of this pin is a rod 28, the position and action of which is controlled by the lever 29 that is actuated from a cam in the manner common in the class of closed die headers. After the blank is reduced and lengthened by being driven into the extruding die and headed by the punches, the knock-out pin is driven forward so as to force the extruded end of the blank from the extruding die into the movable dies.

As the knock-out pin pushes the extruded end of the blank from the extruding die the toggles 10 through the yoke 17 return the `movable die 3 to the feed line, and if the spring 18 was not restrained until the extruded end of the blank wasv fully ejected from the extruding die this reduced end 30 of the blank 31 would be bent by the pressure of the die 4. For the purpose of preventing the bending of the reduced end of the blank the outer cnd of the plunger 19 is provided with a head 32 that has a beveled lower face, and a bolt 33 with a beveled upper end is arranged to engage with this head and hold the plunger 19 until the knock-out pin has pushed the reduced end of the blank completely out of the extruding die.

The bolt shown is vertically movable in a bracket 34 attached to the side of the machine frame, and movably fitted in it is a rod 35. The bolt and the rod are held together by a pin 36 that will shear if the movement of the bolt is accidentally obstructed. Fig. 3. The lower end of the rod is engaged by a screw 37 which is threaded into the end of a lever 38 that has a roll 39 which is engaged by a cam block 40. This cam block, in the forni illustrated, is attached to the end of the punch transfer lever 41 which is reciprocated from the cam 42 on the shaft 43. The action and function of this transfer lever being well known, and disclosed in the Gaess Patents No. 1,372,132, March 22, 1921, and No. 1,437,935, December 5, 1922, also the Campbell patent above mentioned, its connections with the vertically movable punch carrying slide 26, are not illustrated, as such form no feature of the invention.

As the transfer lever 41 comes forward for lifting the punch slide 26 the roll 39 rides up on the cam block and causes the screw 37 in the end of the lever 38 to lift the bolt into engagement with the head 32 of the plunger 19 and thus temporarily prevent the spring 18 from moving thedie 4. As the punch transfer lever is drawn back the roll rides down the cam block and allows the bolt to drop and release the head of the plunger 19 and permit the spring 18 to force the die 4 over from heading line to the feed line. The cam block is so adjusted with relation to the other mechanisms of the machine that the bolt releases the plunger immediately after the knock-out pin has pushed the reduced end of the blank completely from the extruding die at which time there is no danger of bending the blank by the pressure of the die 4. l

The invention claimed is:

1. A heading machine having a die pocket, a cutting die and an extruding die fixed in said pocket and dies movable transversely in the pocket, means for vfeeding stock through the `cutting die and movable dies, means for moving both movable dies together across the cutting die and severing a length of the stock and carrying it into line with the extruding die, a reciprocating punch adapted to strike the stock held by the movable dies and drive its inner end into the extruding die, means for -ejecting the stock from the extruding die, means for returning one movable die to line with the cutting die while the stock is being ejected from the extruding die, and means for restraining the return of the other movable die until after the stock has been ejected from the eXtruding die.

2. A heading machine having a die pocket, a cutting die and an eXtruding die fixed in said pocket and dies movable transversely in the pocket, means for feeding stock through the cutting die and movable dies, toggles for moving both movable dies together' across the cutting die and severing a length of the stock and carrying it into line with the eX- truding die, a reciprocating punch adapted to strike the stock held by the movable dies and drive its inner end into the AeXtruding die, means for ejecting the stoclr from the extruding die7 means connecting said toggles with one movable die for returning said die to line with the cutting die while the stock is being ejected from the extruding die, and means for restraining the return of the other movable die until after the stock has been ejected from the extruding die.

A heading machine having a die pocket, a cutting die and an extruding die fixed in said pocket and dies movable transversely in the pocket, means for feeding stock through the cutting die and movable dies, toggles for moving both movable dies together across the cutting die and severing a length of the stock and carrying it into line with the extruding die, a reciprocating punch adapted to strike the stock held by the movable dies and drive its inner end into the extruding die, means for ejecting the stock from the extruding die, means connecting the toggles with one movable die for returning said die to line With the cutting die While the stock is being ejected from the extruding die, a spring for returning the other movable die, and means for restraining the action of said spring until after the stock has been ejected from the extruding die.

4. A heading machine having a die pocket, a cutting die and an extruding die fixed in said pocket and dies movable transversely in the pocket, means for feeding stock through the cutting die and movable dies, toggles for moving both movable dies together across the cutting die and severing a length of the stock and carrying it into line With the eXtruding die, a reciprocating punch adapted to strike the stock held by the movable dies and drive its inner end into the extruding die7 means for ej ecting the stock from the extruding die, a yoke connecting the toggles With one movable die for returning said die to line with the cutting die While the stock is being ejected from the eXtruding die, a spring for returning the other movable die, a bolt arranged to obstruct the action of said spring until after the stock has been ejected from the extruding die, and a cam arranged to control the position of said bolt.

5. A heading machine having a die pocket,

a cutting die and an eXtruding die fixed in said pocket and dies movable transversely in the pocket, means for feeding stock through the cutting die and movable dies, means for moving both movable dies together across the cutting die and severing a length of the stock and carrying it into line With the extruding die, a reciprocating punch adapted to strike the stock held by the movable dies and drive its inner end into the eXtruding die, means for ejecting the stock from the extruding die, means for returning one movable die to line with the cutting die While the stock is being ejected from the extruding die, a spring for returning the other movable die, a sectional bolt arranged to obstruct the action of said spring until after the stock has been ejected from the extruding die, the sections of said bolt being held together by a shear pin, and a cam for controlling the position of said bolt.

6. A heading machine having a fixed cutting die and a fixed extruding die and dies movable transversely of the cutting and eX- truding dies, means for moving both movable dies together from in line With the cutting die into line With the extruding die, means for returning the movable d ies from in line with the extruding die into line with the cutting die, independently of each other, and means for restraining the return of one movable die until after the other movable die has moved away therefrom.

7. A heading machine having a fixed cutting die and a fixed extrudving die and dies movable transversely of the cutting and eX- truding dies, toggles for moving both movable dies together across the cutting die and into line With the extruding die, means connecting said toggles With one mov-able die for returning said die into line With the cutting die, a spring for returning the other movable die, and means for restraining the action of said spring until the movable dies are separated.

8. A heading machine having transversely movable. dies, toggles arranged to move both movable dies together transversely, means connecting said toggles with one movable die so that die Will be returned by the toggles, a spring for returning the other movable die, a bolt arranged to restrain the action of said spring until after the toggles have separated the dies, and a. cam for controlling the position of said bolt.

JOHN E. PRACNY. 

